Driver to drive?

Dave VanHorn wrote:

There was a time that I was buying magnets that were supposed to be matched
within 5% (no big trick) but our vendor started using chinese sources
without telling us, and the peak flux went wild, 20-2200 gauss in the same
batch! That's a bit out of tolerance!
Click to expand...
Friend of mine buys chinese optics - sample mirrors flat to a 1/10th
wave. production 50% of them were more than 10 WAVES bent ! He didn't
have any incoming goods Q.C. either, so the mirrors got built into
production.

Steve
 
ChrisGibboGibson <chrisgibbogibson@aol.com> says...

Suggestions ?
Click to expand...
I suggest asking questions about software in a software
newsgroup, not an electronics engineering newsgroup.
 
Guy Macon wrote:

ChrisGibboGibson <chrisgibbogibson@aol.com> says...

Suggestions ?

I suggest asking questions about software in a software newsgroup, not an
electronics engineering newsgroup.
Click to expand...
Like I care. It's not a software question.

Gibbo
 
nospam wrote:

chrisgibbogibson@aol.com (ChrisGibboGibson) wrote:

And I'd also like to see any other *serious* contenders for A/D at sensible
accuracy levels for next to *no* outlay.

Two precision voltage references, a precision current source, a comparator,
3 way multiplexor and a microprocessor is next to no outlay?
Click to expand...
With the exception of the current source all the rest of it was already there
in the circuit.

If you use a MOSFET to reset the integrating capacitor to a 'good' 0v then
you can dispense with the 2.5v reference and only require a two way
multiplexor. Slightly better performance and a little closer to *no*
outlay.
Click to expand...
I tried that inititally. No matter what I did, the start of the ramp was
slightly curved. It's not as good, and as the 2V5 ref was already there, the
other solution cost no more.

Gibbo
 
Subject: how to make a counter/timer circuit for 35GHz
From: ftls1@uaf.edu (ftls1@uaf.edu)
Date: 03/10/2004 00:17 GMT Standard Time
Message-id: <44042ede.0410021517.4703bf98@posting.google.com

Hi,All


As is well known, digital design is very easy to make a low-frequency
16-bit circuits. But now I have a square wave working at 35GHz, how
can I make an appropriate counter to measure this signal.btw,
resolution of ps(-1) is okey.


thanks!
Click to expand...
Hi, if you can produce a 35GHz squarewave you allready know far more then
anyone else on this usernet. maybe you could educate us and explain how you did
it.
 
On 03 Oct 2004 02:46:45 GMT, chrisgibbogibson@aol.com (ChrisGibboGibson) wroth:


And I'd also like to see any other *serious* contenders for A/D at sensible
accuracy levels for next to *no* outlay.

Gibbo
Click to expand...
Many uPs have PWM outputs built into their on-board counter/timers.
Filter the PWM output and compare it to the analog input. Adjust the PWM until
successive adjustments make the comparator output toggle. The PWM ratio is
proportional to the converted voltage. One RC filter and one comparator. No
dielectric absorption to worry about. The programming overhead is minimal too.

Jim
 
I read in sci.electronics.design that john jardine
<john@jjdesigns.fsnet.co.uk> wrote (in <cjp3bh$b6s$1@newsg2.svr.pol.co.u
k>) about 'Marketing blurb - bullsh*t baffles etc', on Sun, 3 Oct 2004:

If he'd an hour glass figure
Click to expand...
I feel sure his great-uncle was the 'Gibson', not the 'Girl'.

with 12" waist and a yellow pallour then
maybe :). I believe it was based on a late 30's American newspaper
icon.
Click to expand...
No, much earlier; Charles Dana Gibson, Victorian artist:

http://www.mutoworld.com/Gibson.htm

An artistic style widely copied; a (female) friend of mine has a drawing
of three GGs teasing a tiny man with pins. (;-)
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
On Sat, 02 Oct 2004 20:02:34 +0000, Fred Bloggs wrote:

Clarence wrote:


If Bush fired everyone in government who made a mistake he would have no one in
the government at all, starting with the Democrats who like to point out that
everything Bush people do are mistakes! :)}) Not that it would be all bad
to fire all the democRats first!

You are paid Bush campaign operative- you are a disruptive troublemaker,
slanderer, liar, and crook- just like your candidate! Bush stands for
CRIMINAL TRAITOR to America.
Click to expand...
You are paid Kerryh campaign operative- you are a disruptive
troublemaker, slanderer, liar, and crook- just like your candidate!
Kerry stands for CRIMINAL TRAITOR to America.

All the words even work!

--
Keith
 
On Sun, 3 Oct 2004 09:40:25 +0100, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> wrote:

I read in sci.electronics.design that ChrisGibboGibson
chrisgibbogibson@aol.com> wrote (in <20041002181947.11054.00001314@mb-
m14.aol.com>) about 'Marketing blurb - bullsh*t baffles etc', on Sat, 2
Oct 2004:
(Ken Smith) wrote:


interspectral Gibboscopy


Obviously I'd go with that but I doubt it would sell anything.

It's a horrible Latin-Greek hybrid meaning 'hump watching'.
Click to expand...
Better known in Essex car parks as "dogging", I believe.

d
Pearce Consulting
http://www.pearce.uk.com
 
I read in sci.electronics.design that Don Pearce <donald@pearce.uk.com>
wrote (in <41602071.36686500@news.plus.net>) about 'Marketing blurb -
bullsh*t baffles etc', on Sun, 3 Oct 2004:

Better known in Essex car parks as "dogging", I believe.
Click to expand...
Whatever turns you on, baby!

No-one can afford to stay in an Essex car park for long enough, these
days. (;-)
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
On Saturday 02 October 2004 08:55 pm, Tom Seim did deign to grace us with
the following:

Go get it yourself, you lazy blow hard. You aren't a member of the
IEEE, are you?

Cite the complete reference- you worthless Bush shill and lying
hack...cite the full reference so that more of your lies can be exposed!

Get off your lazy ass and do it yourself.
Click to expand...
I'll show you mine if you show me yours.
 
On Saturday 02 October 2004 08:57 pm, Mac did deign to grace us with the
following:

On Sun, 03 Oct 2004 02:23:08 +0000, ChrisGibboGibson wrote:
[snip]

That was the basis of my post a few days ago regarding a highly accurate
CC generator.

Until I actually tried this (with Fred's CC generator) I couldn't believe
the accuracy that could be got from such a small outlay.

Gibbo

What exact circuit did you use for the CC generator? You were going to use
a source rather than a sink, weren't you?

The sophisticated thing to do would be to have one of each. Then you could
Click to expand...
call it dual-slope. :)

Cheers!
Rich
 
Tom Seim wrote:
Other reasons to use d.c. include:
* Simplified permitting and right of way acquisitions (no magnetic
fields)
Click to expand...
"No magnetic fields" due to DC current? Interesting- looks like EM 101
is not one of your stronger abilities.
 
Tom Seim wrote:

It is, obviously, the a.c. fields that are people are concerned about,
as they induce currents in people and/or things, which d.c. fields
cannot do. We are constantly exposed to a d.c. magnetic field (the
Earth's).
Click to expand...
"...that are people are concerned about,..." sounds like pretty
"fractured" English for a college graduate. Are you even a college
graduate, Tom? Tell us a little about yourself, a college degree is not
everything, we just want you to come clean on your impersonation of
having an education.:)
 
From: soar2morrow@yahoo.com (Tom Seim)

Want a link? Go to
http://www.ulita.com/beheading.php
Best not see it right after eating.
I have no reservations, especially after watching this garbage, that
these terrorists must be killed at the earliest possible convenience.
Click to expand...
Good, now if only you had some aversion to mass producing them?

Rocky
 
On Sunday 03 October 2004 08:11 am, Dave VanHorn did deign to grace us with
the following:

You need at least NINE kHz. There is no second harmonic in a square
wave, but there is every odd harmonic. Preserving the third and fifth
gets you a fair approximation to a square wave, but the phase-shift in a
cassette recorder makes the 15 kHz response (if any) of little
advantage.

We don't particularly need a good reproduction of the waveform, so I think
less is adequate.
--
Click to expand...
Well, how do they get 56KBPS(Kbps?) down a 3KHz channel? Wouldn't that work
on a cheap tape recorder? Or 9600, for that matter.

Thanks,
Rich
 
On Saturday 02 October 2004 08:33 pm, Tom Seim did deign to grace us with
the following:

I have no reservations, especially after watching this garbage, that
these terrorists must be killed at the earliest possible convenience.


Tom
Click to expand...
Well, it's the "Kill First" mentality that will destroy the world if it's
allowed to take over.

May God have mercy on us all.

Thanks,
Rich
 
John Woodgate wrote:

I read in sci.electronics.design that Tim Wescott
tim@wescottnospamdesign.com> wrote (in <10lug3s5h4ff609@corp.supernews.
com>) about 'how to make a counter/timer circuit for 35GHz', on Sat, 2
Oct 2004:

If it's fairly narrowband the standard thing to do is to heterodyne it
down to something more reasonable and count that.


A narrow-band square wave I'd very much like to see. (;-)
Click to expand...
OK, bad choice of wording.

* If it doesn't change frequency by more than a few GHz
* If it isn't amplitude modulated by more than 50% or so
* If it doesn't start and stop (see "change frequency")

then it will act as if it were a narrowband sine wave (etc.)

There, happy?

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
 
Kevin Aylward wrote:

Again, why do I bother.
Click to expand...
strange question from a guy who doesn't believe in free will.

But then I suppose its your destiny both to bother and
to ask why you bother.

If a guy in the woods without free will
asks himself why he's there,
did a question get asked?
 
On Saturday 02 October 2004 05:56 pm, Charles Schuler did deign to grace us
with the following:

waste my time. I know who to vote for. However, I live in Florida, so it
might not count.
Click to expand...
Of Course. Michael Badnarik.
http://www.lp.org/campaigns/pres


Cheers!
Rich
 
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